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Security advisory

Type: advisorySources: OSVCVE: CVE-2021-32679

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.0.11, and 21.0.3, filenames where not escaped by default in controllers using `DownloadResponse`. When a user-supplied filename was passed unsanitized into a `DownloadResponse`, this could be used to trick users into downloading malicious files with a benign file extension. This would show in UI behaviours where Nextcloud applications would display a benign file extension (e.g. JPEG), but the file will actually be downloaded with an executable file extension. The vulnerability is patched in versions 19.0.13, 20.0.11, and 21.0.3. Administrators of Nextcloud instances do not have a workaround available, but developers of Nextcloud apps may manually escape the file name before passing it into `DownloadResponse`.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2021-32679
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 11:46 UTC · Revision 1

Source evidence

CVE-2021-32679

core-osv · Original source

Published 12 Jul 2021, 13:15 UTC

Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.0.11, and 21.0.3, filenames where not escaped by default in controllers using `DownloadResponse`. When a user-supplied filename was passed unsanitized into a `DownloadResponse`, this could be used to trick users into downloading malicious files with a benign file extension. This would show in UI behaviours where Nextcloud applications would display a benign file extension (e.g. JPEG), but the file will actually be downloaded with an executable file extension. The vulnerability is patched in versions 19.0.13, 20.0.11, and 21.0.3. Administrators of Nextcloud instances do not have a workaround available, but developers of Nextcloud apps may manually escape the file name before passing it into `DownloadResponse`.

osv:CVE-2021-32679
Complete source record
{
  "id": "b30826e4d9c8e3bc52f34b2a709ad678e01de8473e86ef486fd9658fcd0d353b",
  "url": "https://osv.dev/vulnerability/CVE-2021-32679",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-32679",
    "summary": "Nextcloud Server is a Nextcloud package that handles data storage. In versions prior to 19.0.13, 20.0.11, and 21.0.3, filenames where not escaped by default in controllers using `DownloadResponse`. When a user-supplied filename was passed unsanitized into a `DownloadResponse`, this could be used to trick users into downloading malicious files with a benign file extension. This would show in UI behaviours where Nextcloud applications would display a benign file extension (e.g. JPEG), but the file will actually be downloaded with an executable file extension. The vulnerability is patched in versions 19.0.13, 20.0.11, and 21.0.3. Administrators of Nextcloud instances do not have a workaround available, but developers of Nextcloud apps may manually escape the file name before passing it into `DownloadResponse`.",
    "evidence": "osv:CVE-2021-32679",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-32679",
      "aliases": [
        "CVE-2021-32679",
        "GHSA-3hjp-26x8-mhf6"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3845aa47869e6787bf9b25cae59f9b999c6f7807"
                },
                {
                  "introduced": "615b994816710a595243d704c9be445f736b4b41"
                },
                {
                  "fixed": "3eb0ce9892933c36672e8ba35e771e48a5309321"
                },
                {
                  "introduced": "8985b7930653139859002eb3eca2852999ed8f0d"
                },
                {
                  "fixed": "5d04a3fed226c370feca686032f47d5422b02bb2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "19.0.13"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "20.0.0"
                      },
                      {
                        "fixed": "20.0.11"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "21.0.0"
                      },
                      {
                        "fixed": "21.0.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v19.0.13rc1",
            "v21.0.3rc1",
            "v20.0.11rc1",
            "v19.0.11",
            "v20.0.10",
            "v21.0.2",
            "v19.0.11RC1",
            "v20.0.10RC1",
            "v21.0.2RC1",
            "v19.0.10",
            "v20.0.9",
            "v21.0.1",
            "v19.0.10RC1",
            "v21.0.1RC1",
            "v20.0.9RC1",
            "v19.0.9",
            "v20.0.8",
            "v21.0.0",
            "v19.0.9RC1",
            "v20.0.8RC1",
            "v20.0.7RC1",
            "v20.0.7",
            "v19.0.8",
            "v20.0.6",
            "v19.0.8RC1",
            "v20.0.6RC1",
            "v19.0.7",
            "v20.0.5",
            "v20.0.5RC2",
            "v19.0.7RC1",
            "v20.0.5RC1",
            "v20.0.4",
            "v19.0.6",
            "v20.0.3",
            "v19.0.6RC2",
            "v20.0.3RC2",
            "v19.0.5",
            "v20.0.2",
            "v19.0.5RC2",
            "v20.0.2RC2",
            "v19.0.5RC1",
            "v20.0.2RC1",
            "v20.0.1",
            "v20.0.1RC1",
            "v19.0.4",
            "v19.0.4RC2",
            "v20.0.0",
            "v19.0.40RC1",
            "v19.0.3",
            "v19.0.3RC1",
            "v19.0.2",
            "v19.0.2RC2",
            "v19.0.2RC1",
            "v19.0.1",
            "v19.0.1RC1",
            "v19.0.0",
            "v19.0.0RC3",
            "v19.0.0RC1",
            "v19.0.0beta7",
            "v19.0.0beta6",
            "v19.0.0beta5",
            "v19.0.0beta4",
            "v19.0.0beta3",
            "v19.0.0beta2",
            "v19.0.0beta1",
            "v18.0.0RC1",
            "v18.0.0beta4",
            "v18.0.0beta3",
            "v18.0.0beta2",
            "v18.0.0beta1",
            "v17.0.0beta4",
            "v17.0.0beta3",
            "v17.0.0beta2",
            "v17.0.0beta1",
            "v16.0.0RC1",
            "v16.0.0beta3",
            "v16.0.0beta2",
            "v16.0.0beta1",
            "v16.0.0alpha1",
            "v15.0.0RC1",
            "v15.0.0beta2",
            "v15.0.0beta1",
            "v14.0.0RC2",
            "v14.0.0RC1",
            "v14.0.0beta4",
            "v14.0.0beta3",
            "v14.0.0beta2",
            "v14.0.0beta1",
            "v13.0.0RC1",
            "v13.0.0beta4",
            "v13.0.0beta3",
            "v13.0.0beta2",
            "v13.0.0beta1",
            "v12.0.0beta4",
            "v12.0.0beta3",
            "v12.0.0beta2",
            "v12.0.0beta1",
            "v11.0.0",
            "v11.0RC2",
            "v9.1.0beta1",
            "v9.0.0beta2",
            "v9.0beta1",
            "v8.2RC1",
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            "v8.1RC2",
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            "v8.1.0alpha2",
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            "v8.0.0alpha2",
            "v8.0.0alpha1",
            "v7.0.0beta1",
            "v7.0.0alpha2",
            "v6.0.0RC2",
            "v6.0.0RC1",
            "v6.0.0beta5",
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            "v6.0.0beta2",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32679.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:42.150607408Z",
      "provider": "osv",
      "references": [
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BVZS26RDME2DYTKET5AECRIZDFUGR2AZ/",
        "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J63NBVPR2AQCAWRNDOZSGRY5II4WS2CZ/",
        "https://github.com/nextcloud/security-advisories/security/advisories/GHSA-3hjp-26x8-mhf6",
        "https://security.gentoo.org/glsa/202208-17",
        "https://hackerone.com/reports/1215263",
        "https://github.com/nextcloud/server/pull/27354"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*",
              "cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"
            ],
            "vendor_product": "fedoraproject:fedora",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "33"
                  },
                  {
                    "last_affected": "33"
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                  {
                    "introduced": "34"
                  },
                  {
                    "last_affected": "34"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-32679",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385930,
  "published_at": "2021-07-12T13:15:08.013+00:00"
}